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On Nov 6, 4:26*am, oriel36 wrote:
that when readers here can actually see *how Uranus turns to the central Sun as a means to visually affirm the slow and uneven turning of a planet as a signature of its orbital motion and *which is crucial for explaining the *seasons when allied with daily rotation, it exasperates me no end - http://astro.berkeley.edu/~imke/Infr..._2001_2005.jpg The daily rotation of Uranus to the central Sun follows the line of the Equatorial ring which in turn acts like an orbital longitude meridian, Actually, the situation of the planet Uranus is a very bad example for your view of planetary rotation. Let us suppose - hypothetically, and I know you don't like that - the Earth had a strong inclination like that of Uranus. That would mean in your terminology that most of the Earth would have "polar" seasons instead of "equatorial" seasons - being dark 24 hours for much of the year and light 24 hours for much of the year. An observer on the Equator of this planet (and likely only a narrow strip around the Equator would be habitable) - what would he see? Because the Sun's apparent motion in the sky due to the Earth's orbit around the Sun would now be like a polar orbit instead of an equatorial one, instead of experiencing a natural noon cycle with an apparent period of 24 hours, he would find that the time between successive natural noons was closer to 23 hours and 56 minutes. During part of the year, it would be slightly shorter, and during the other half of the year, slightly longer. However, at the two solstices, day and night would exchange places, and this jump would make up for the difference between the sidereal "day" of 23 hours and 56 minutes and the synodic period of 24 hours. I think they would just take holidays around the solstices to get their sleep cycles in step rather than living with clocks showing an average 24 hour day the year around. John Savard |
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